Some of the highlights of the summer’s sporting programme could be a washout as the wet weather looks set to continue for the next 30 days.

Tourists make their way across the grounds of Westminster Abbey in scenes likely to be repeated all month (Picture: EPA)

Royal Ascot, Wimbledon, the Henley Royal Regatta and pre-Olympic festivals are at risk as the high-altitude Atlantic jet stream winds, which normally brings warm weather, has swung south.

Met Office forecaster Michael Lawrence said: ‘We’re going through a very unsettled period with successive areas of low pressure expected.

‘This Friday again looks like being windy in the south, with a low risk of gales. There’s certainly no clear signal of a protracted dry spell in the 30-day outlook. Showers will temper sunny spells.

‘There’s perhaps a chance of less unsettled weather in the second half of the month, but the jet stream has shifted south, so we’re catching unsettled conditions.’

The 24-hour period to Saturday morning was believed to be Britain’s wettest day since the Cumbrian floods in 2009 when a record 316mm fell.

Winds at the weekend reached 132kph (82mph) in the strongest summer storm Britain has seen since records began in 2001. Hundreds of trees were toppled, causing power cuts, closed roads as well as disruption to ferry and train lines.

A total of 200,000 music fans were hit by mudbath conditions at the weekend at the Download festival in Donington Park, Leicestershire, and Rockness, near Loch Ness. An alert for isolated flooding in the north was issued by the Met Office yesterday as more downpours hit.

The Environment Agency had three flood warnings and 24 alerts in place across England and Wales.

Heavy and ‘possibly thundery showers’ were predicted by the Met Office for today and tomorrow with heavy rain and thunder, especially in the south of England.

After next weekend there is a slightly increased chance of more settled conditions further south with unsettled weather further north, it added.

‘From June 23 to July 7, there’s a possibility of slightly more settled conditions in the south, with rainfall around or slightly below average,’ it predicted.

‘Into July, there is a weak signal for slightly wetter conditions in the north. Temperatures will remain average throughout.’

Weather Online predicted a week-long drenching later this month, with possible gales.

Forecaster Simon Keeling said: ‘The final week of June is expected to see the whole of the UK affected by low pressure, potentially heavy rain and strong winds, with temperature suppressed.’

Royal Ascot starts on June 19, the London 2012 festival begins two days later, Wimbledon fortnight commences on June 25 and the Henley regatta takes place from June 27 to July 1.